Reduction of an optically active aldopentose with NaBH4 gives an optically inactive alditol. The aldopentose could be: 
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Q17: Which of the following is a disaccharide?
A)
Q18: Which of the following represents a furanose?
Q19: What is (are) the major organic product(s)
Q20: Which carbon in the following carbohydrate is
Q21: The following compound will react with Tollens'
Q23: Which of the following is an alditol?
A)
Q24: Oxidation of optically active D-erythrose with nitric
Q25: A 1,4-α-linkage between two glucose units produces
Q26: Consider the following Fisher projections. 
Q27: Which of the following is vitamin C?
A)
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